MPLS VPN-based network technology program is currently the second floor there are two, namely, such as proposed by Kompella Layer VPN, and Martini and other raised floor VPN. These two programs are similar data plane, can support multiple data link layer technologies such as Frame Relay, ATM AAL5 CPCS mode, ATM transparent cell mode, Ethernet, Ethernet VLAN, Cisco HDLC and PPP and so on, their main difference is that the control plane protocols. The following two options were discussed specific implementation. Kompella Layer VPN, in the implementation of the program is divided into the following three steps: first, the establishment of LSP. Network in the PE routers pre-established LSP, can be RSVP-TE, LDP or CR-LDP in any way. The LSP can be used for a variety of services, including traditional Internet, Layer VPN, VPN, three. This step is actually a network of providers, a necessary step in the implementation of MPLS, and VPN implementation of the second floor is relatively independent.
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